JP4289579B2 - Casting sand filling vibration device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
More particularly, the present invention relates to a vibrating table on which a casting frame can be placed and elastically supported, and the vibrating table is vibrated by rotation of an unbalanced weight mounted on the vibrating table. The present invention relates to an improvement in a foundry sand filling vibration device including an unbalanced weight type vibration motor for applying vibration to the casting frame to fill the foundry sand.
[0002]
[Prior art]
Conventionally, in disappearance model casting methods that use foundry sand that does not contain any binder, and self-hardening molds that use foundry sand that contains a small amount of binder, the casting sand is sufficiently contained in the casting frame for efficiency. In order to fill well, a vibration table that applies vibration to the casting frame is used.
[0003]
By the way, the above-mentioned vibration table needs to impart circular motion to the foundry sand during vibration in order to sufficiently fill the foundry sand into the casting frame and efficiently fill the foundry sand. For this reason, conventionally, as disclosed in Japanese Patent Laid-Open No. 10-328783, the two unbalanced weight type vibration motors described above are provided at the left and right side positions of the casting frame on the vibration table, and the two rotation shafts are provided. A casting sand filling vibration device has been proposed which is mounted parallel to each other and at the height of the center of gravity of the casting frame.
[0004]
[Problems to be solved by the invention]
However, in the conventional casting sand filling vibration device configured as described above, when two unbalanced weights rotate, the two unbalanced weights actually have their phase angles mutually. They do not rotate with each other, so a phase difference occurs between the two unbalanced weights. Thus, when there is a phase difference between the two unbalanced weights, there is a problem that the vibration table cannot be swung left and right to perform a desired circular motion.
[0005]
The present invention has been made to solve the above-described problems, and its purpose is to oscillate the vibration table even if there is a phase difference between the two unbalanced weights in the rotational movement of the two vibration motors. An object of the present invention is to provide a vibrating apparatus for filling foundry sand that does not move.
[0006]
[Means to solve the problem]
In order to achieve the above-mentioned object, the foundry sand filling vibration device according to the first aspect of the present invention includes a vibration table on which a casting frame can be placed and elastically supported, and the rotation of an unbalanced weight mounted on the vibration table. An unbalanced weight type vibration motor that vibrates a vibration table, and in the casting sand filling vibration device that fills casting sand by applying vibration to the casting frame, the vibration motor is fixed to the casting frame. Two rotating shafts are mounted on both sides of the casting frame on the upper surface of the vibration table, with the rotation shafts on the same line, and the rotation axis of the vibration motor is connected to the vibration table, the two vibration motors, the casting frame, and It passes almost the center of gravity of the entire elastically supported vibration device including the foundry sand in the casting frame, and the two vibration motors have the unbalanced weight at a constant speed. Is rotated in one direction, characterized in that.
[0007]
In such a configuration, when two vibration motors are driven and two unbalance weights are rotated at the same speed in the same direction, a phase difference between the two unbalance weights in this rotational movement is obtained. As shown in FIG. 1, the rotational moment due to the two unbalanced weights is smaller than when there is no phase difference, but the rotational axis of the vibration motor passes almost the center of gravity of the entire vibration device. As a result, the length of the arm at the rotational moment that causes the swing is zero, and the rotational moment does not occur, so the swing does not occur. F is the centrifugal force due to the unbalanced weight, and L is the rotation radius of the unbalanced weight. Further, as shown in FIG. 2, the rotational moment due to the unbalanced weight changes as the phase difference changes.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described in detail with reference to FIGS. As shown in FIGS. 3 and 4, the casting sand filling vibration device according to the first embodiment of the present invention has a casting frame 1 mounted thereon and coil springs 3 and 3 on a machine base 2. An elastically supported vibration table 4 and two unbalanced weight type vibration motors 6 and 6 that are attached to the vibration table 4 and vibrate the vibration table 4 by the rotation of a pair of unbalance weights 5 and 5. It is.
[0009]
The two vibration motors 6 and 6 are mounted on the upper surface of the vibration table 4 on both the left and right sides of the casting frame 1 with their rotation axes positioned on the same line, and the vibration motors 6 and 6 are mounted. Is a vibration supported by the coil spring 3, 3 including the vibration table 4, the two vibration motors 6, 6, the casting frame 1, the foundry sand 7 in the casting frame 1, and the vanishing model M. The two vibration motors 6 and 6 pass through the center of gravity of the entire apparatus, and the unbalanced weights 5 and 5 are rotated at the same speed in the same direction.
[0010]
When the two vibration motors 6 and 6 are driven to rotate the two pairs of unbalanced weights 5 and 5 at the same speed in the same direction, the two unbalanced weights 5 are configured as described above. If there is a phase difference between the five, as shown in FIG. 1, the magnitude of the rotational moment due to the two pairs of unbalanced weights 5 and 5 is smaller than when there is no phase difference, but the vibration motors 6 and 6 Since the rotation axis passes through almost the center of gravity of the entire vibration device, the length of the arm at the rotational moment that causes the oscillation becomes zero, and the rotational moment does not occur, so the oscillation does not occur. In addition, the rotational moment due to the two pairs of unbalanced weights 5 and 5 changes as the phase difference due to the pair of unbalanced weights 5 and 5 changes.
F is the centrifugal force due to the unbalanced weight, and L is the rotation radius of the unbalanced weight.
[0011]
When the apparatus of the first embodiment becomes large, the two vibration motors 6 and 6 cannot rotate at the same speed with each other. Therefore, as shown in FIG. Each of the vibration motors 6 and 6 has a toothed pulley 7 fitted on one end of each rotating shaft, and a rotating shaft 9 fitted with toothed pulleys 8 and 8 fitted on both ends on the lower surface of the vibration table 4. The toothed pulleys 7 and 7 of the vibration motor 4 and the toothed pulleys 8 and 8 of the rotary shaft 9 are connected by the timing belt 10 so that the two vibration motors 6 and 6 are rotated at the same speed in the same direction. It may be. However, the casting frame 1, the machine base 2, the coil springs 3 and 3, the vibration table 4, the unbalance weights 5 and 5 and the two unbalance weight type vibration motors 6 and 6 are diverted to those described above. Description is omitted.
[0012]
Similarly, when the first embodiment is large, the two vibration motors 6 and 6 cannot mutually rotate at a uniform speed. As described above, the two vibration motors 6 and 6 are provided with the unbalanced weight phase difference detection device 11 at one end of each rotating shaft, and the two vibration motors 6 are provided by the two phase difference detection devices 11 and 11. The phase difference between the unbalanced weights at 6 is detected and a synchronizing signal is sent from the phase difference control device 12 to the two vibration motors 6 based on these detection signals. May be rotated at the same speed in the same direction. However, the casting frame 1, the machine base 2, the coil springs 3 and 3, the vibration table 4, the unbalance weights 5 and 5 and the two unbalance weight type vibration motors 6 and 6 are diverted to those described above. Description is omitted.
[0013]
Furthermore, when the cast frame 1 or the like is replaced, the position of the center of gravity of the elastically supported vibration device as a whole including the two vibration motors 6 and 6, the cast frame 1 and the foundry sand in the cast frame 1 changes. In order to match the center of rotation axis of the vibration motors 6 and 6 with the horizontal center of gravity of the entire vibration device, as shown in FIG. It is preferable that the vibration table 4 is mounted on the vibration table 4 so that the vertical adjustment is possible. That is, as shown in FIG. 6A, the vertical adjustment mechanism 13 places the lifting platform 15 on a pair of overlapped wedges 16 and 17, and horizontally moves one of the wedges 16 and 17. Thus, the lifting platform 15 is moved up and down so that the vibration motor 6 can be adjusted up and down. However, the casting frame 1, the machine base 2, the coil springs 3 and 3, the vibration table 4, the unbalance weights 5 and 5 and the two unbalance weight type vibration motors 6 and 6 are diverted to those described above. Description is omitted.
[0014]
Further, as shown in FIG. 6B, the vertical adjustment mechanism 14 mounts the lifting platform 18 on two threaded struts 19 and 19 via nuts 20 and 20 and 21 and 21 screwed to these. The vibration motor 6 can be adjusted up and down by raising and lowering the elevator 18 by raising and lowering the nuts 20 and 21.
[0015]
Furthermore, in the above-described embodiment, an example applied to filling of foundry sand in vanishing model casting has been described. However, even if the present invention is applied to molding a self-hardening mold, You can get an effect.
[0016]
【The invention's effect】
As is apparent from the above description, the present invention includes a vibration table on which a casting frame can be placed and elastically supported, and an unbalance weight type that is attached to the vibration table and vibrates the vibration table by rotation of the unbalance weight. A foundry sand filling vibration device for applying vibration to the casting frame to fill the foundry sand, wherein the vibration motor is provided on the upper surface of the vibrating table to which the casting frame is fixed. Two pieces are mounted on both side positions with the rotation axis on the same line, and the rotation axis of the vibration motor includes the vibration table, the two vibration motors, the casting frame, and the foundry sand in the casting frame. The two vibration motors pass through almost the center of gravity of the entire vibration-supported vibration device, and the two vibration motors rotate in the same direction at the same speed. Even if there is a phase difference between the two unbalance weights in rotational movement of the moving motor, the vibration table exhibits an excellent practical effect, such is not to swing.
[0017]
In addition, in the actual model of disappearance model, the floor sand is linearly vibrated and circular motion is applied after the model is placed. There is a need. Such switching can be easily performed only by changing the rotation direction of the vibration motor.
[Brief description of the drawings]
[Fig. 1] When two vibration motors are rotated in the same direction at the same speed while keeping the phase difference constant, the phase difference is 45 °, 90 °, 120 °, 150 °, 180 °, 210 °, 240 ° And the rotational moment formed by the two balance weights at 270 ° and 270 °, respectively.
FIG. 2 is a graph showing a state in which a rotational moment due to a balance weight changes with a change in phase difference of a vibration motor.
FIG. 3 is a plan view showing an embodiment of the present invention.
4 is a side view of FIG. 3. FIG.
FIG. 5 is a front view showing another embodiment of the present invention, and there are two examples, i and b.
FIG. 6 is a front view showing another embodiment of the present invention, and there are two examples, i and b.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cast frame 3 Coil spring 4 Vibration table 5 Unbalance weight 6 Vibration motor

Claims (4)

A vibration table on which a cast frame can be placed and elastically supported; and an unbalanced weight type vibration motor that is attached to the vibration table and vibrates the vibration table by rotation of an unbalance weight. In the casting sand filling vibration device for applying and filling the foundry sand,
Two of the vibration motors are mounted on both sides of the casting frame on the upper surface of the vibration table to which the casting frame is fixed, with the rotating shafts positioned on the same line,
The rotational axis of the vibration motor passes through substantially the center of gravity of the entire elastically supported vibration device including the vibration table, the two vibration motors, the casting frame and the foundry sand in the casting frame,
Further, in the two vibration motors, the unbalance weight is rotated in the same direction at a constant speed.
A vibratory apparatus for filling foundry sand characterized by the above. In the foundry sand filling vibration device according to claim 1,
A casting sand filling vibration device, wherein the rotation shafts of the two vibration motors are connected to each other by transmission means so as to rotate at the same speed in the same direction. In the foundry sand filling vibration device according to claim 1,
The foundry sand filling vibration device is provided with a phase difference control device for the unbalanced weight so as to rotate the rotation shafts of the two vibration motors in the same direction at a constant speed. 4. The foundry sand filling vibration device according to claim 1, wherein the two vibration motors are mounted so as to be vertically adjustable via a vertical adjustment mechanism. Vibration device.

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